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Long-Term Incentive Employee Compensation (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Long-Term Incentive Employee Compensation Expense
Compensation costs on equity-based awards	$ 7	$ 8	$ 15	$ 16
Compensation costs on liability-based awards	2	(3)	4	0
Total compensation costs, pre-tax	9	5	19	16
Future tax benefit	$ 3	$ 2	$ 6	$ 5

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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